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A Nano-Cleaning Fluid for Downhole Casing Cleaning.

Hanxuan Song1,2, Yan Ye2,3, Zhen Zhang4

  • 1Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102200, China.

Polymers
|March 29, 2023
PubMed
Summary

This study developed a nano-cleaning fluid to remove sludge in oil and gas wells. The fluid effectively cleans wellbores, reducing drilling delays and costs.

Keywords:
barium sulfate scalecompound evaluation systemnano-emulsionpolymers

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Sludge formation from barite and oil mixtures in drilling and completion projects causes significant delays and increased costs.
  • The sticky nature of sludge on casing hinders drilling progress and necessitates effective cleaning solutions.

Purpose of the Study:

  • To develop and evaluate a novel nano-cleaning fluid system for downhole sludge removal in ultra-deep wells.
  • To utilize nano-emulsions for their low interfacial tension and wetting capabilities to create an efficient cleaning fluid.

Main Methods:

  • Preparation of nano-cleaning fluids using nano-emulsions (approx. 14 nm particle size) within a fiber-reinforced system for enhanced stability.
  • Development of an indoor evaluation instrument simulating downhole conditions (150 °C, 3.0 MPa) to test fluid performance.
  • Analysis of fluid properties, including viscosity and shear values, and cleaning efficiency under simulated conditions.

Main Results:

  • The nano-cleaning fluid system demonstrated effective viscosity (11 mPa·s) and stability (up to 8 h).
  • Cleaning efficiency was significantly influenced by nano-emulsion concentration, achieving 60-85% processing efficiency within 25 minutes.
  • A strong linear relationship was observed between cleaning efficiency and time (R² = 0.98335).

Conclusions:

  • The developed nano-cleaning fluid effectively deconstructs and carries sludge from well walls, achieving successful downhole cleaning.
  • The fluid's performance is optimized by adjusting fiber content and nano-emulsion concentration, offering a promising solution for drilling challenges.